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## Tomcat failover with Memcached + Memcached Session Manager + Nginx (load blancer)
- Tested on Ansible 1.9.3 for Debian
- Expects hosts: Centos 6.x
This playbook deploys a failover solution for clustered Tomcat using Nginx as load balancer and Memcached + MSM as session manager.
- Nginx: balances the requests by round robin.
- Memcached: stores `sessionid` of tomcat.
- MSM: manages tomcat session.
For more detail about session management, see https://github.com/magro/memcached-session-manager
This playbook also deploys a demo web app (https://github.com/magro/msm-sample-webapp) to test the session management.
## Initial setup of inventory file
```
[lb_servers]
lbserver
[backend_servers]
tomcat_server_1
tomcat_server_2
[memcached_servers]
cached_server1
cached_server2
```
Edit inventory file `hosts` to suit your requirements and run playbook:
```
$ ansible-playbook -i hosts site.yml
```
When finished, open web browser and access to http://nginx_ip/ to start testing.
## Ideas and improvements
- Setup SSL for load balancer.
- HA load balancer.
- Hardening iptables rules.
Pull requests are welcome.
## License
This work is licensed under MIT license.
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